public float BSplineBasisFunction(float i, float k, float u)
    {
        float val = 0f;

        if (points.Count - 1f - k + 2f == 0f)
        {
            return 0f;
        }
        if (u < 1f || u > points.Count - 2f - k + 2f)
        {
            return 0f;
        }

        if (T(i, k) <= u && T(i + 1, k) >= u)
        {
            return 1f;
            //val = (((u - T(i, k)) * BSplineBasisFunction(i, k - 1, u)) / T(i + k - 1, k) - T(i, k)) + (((T(i + k, k) - u) * BSplineBasisFunction(i + 1, k - 1, u)) / T(i + k, k) - T(i + 1, k));
        }
        else
        {
            return 0f;
        }



        return val;
    }
    public float T(float i, float k)
    {
        float t = 0f;
        if (i < k)
        {
            t = 0f;
        }
        if (i >= k && i <= points.Count - 1)
        {
            t = i - k + 1;
        }
        if (i > points.Count - 1)
        {
            t = (points.Count-1) - k + 2;
        }
        return t;
    }
    public void BSpl()
    {
        float nForBSpline = points.Count-1;
        float k = 3f;
        float umax=nForBSpline-k+2f;
        for(float u=0;u<=umax;u=u+0.1f)
        {
            float sumX = 0f;
            float sumY = 0f;
            for (int i = 0; i < nForBSpline; i++)
            {

                sumX=sumX+BSplineBasisFunction(i,k,u)*points[i].x;
                sumY = sumY + BSplineBasisFunction(i, k, u) * points[i].y;
                Debug.Log(sumX + " " + sumY);
                DrawPoint(new Vector2(sumX, sumY), Color.red, false);
            }

        }

    }